+44 (0)1737 821590
Essential IMS  |    A 2 day training course

Essential IMS training course description

The IP Multimedia Core Network Subsystem (IMS) is defined by 3GPP as a new mobile infrastructure. This course studies the discreet elements in the IMS.

What will you learn
  • Describe the IMS.
  • Describe the IMS architecture.
  • Explain how charging, security and QoS is handled in the IMS.
  • Explain how the IMS supports service enablers such as Push to talk and Presence.
Essential IMS training course details

Essential IMS training course contents

  • Mobile communications review
  • The role of IP in telecommunications. GSM to IMS. Enhanced multimedia services, Push To, convergence, conferencing, roaming.

  • What is IMS?
  • What it is, why IMS, standard bodies: 3GPP, IETF, OMA, IMS services. MMD comparison.

  • IMS architecture blocks
  • Overview, IMS functions, IMS interfaces, IMS protocols, IMS elements, IMS reference points. Access network, IMS in GSM, CDMA, WiFi & PSTN networks. Core network. Application, Control and Call planes.

  • HSS – User database
  • Identification. The user database, role of HSS, SLF and multiple HSSs. “Normal” identities, IMPI, IMPU.

  • IMS signalling: SIP
  • What is SIP? SIP URI, contact address, UAs, Proxies, basic SIP call flow, SIP sessions.

  • IMS other protocols
  • Megaco, Diameter, XML, XCAP, COPS, RTP/RTCP, SDP, H.324M, IM and MSRP.

  • Call/Session Control
  • Call Session Control Functions (CSCF). Domains. Home networks, visited networks. CSCF and SIP. P-CSCF, P-CSCF discovery, P-CSCF functions. I-CSCF, DNS and I-CSCF. S-CSCF, S-CSCF functions, ENUM lookups. QoS. Example call flows.

  • IMS services
  • Open service platform, Application Servers, profiles, AS interface with S-CSCF. “Normal” services (Caller ID, Call waiting, transfer…) Push to talk Over Cellular (PoC), IMS conferencing, Group management, IMS Presence, IMS Messaging. Other possible applications. Media servers. (MRFC, MRFP).

  • Gateways
  • IMS PSTN procedures, BGCF, PSTN interface. SGW, MGCF, MGW

  • Charging
  • Architecture, Offline, online and flow based charging, charging reference points, CCF, DIAMETER, ICID, IOI.

  • IMS security
  • IMS security architecture, identities, AAA, public and private user ID, service filters, Cx interface, RADIUS, Diameter protocol, 3GPP AKA, integrity, privacy, NDS, IPSEC, trust, assertion.

Learning path



Based on overall ratings

O. B. - Network Rail

"Just one word “BRILLIANT."

L. S. - Arqiva

"Excellent handouts. I like that they are not PowerPoint slides."

Training approach

This structured course uses Instructor Led Training to provide the best possible learning experience. Small class sizes ensure students benefit from our engaging and interactive style of teaching with delegates encouraged to ask questions throughout the course. Quizzes follow each major section allowing checking of learning.